The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 14, 2014
Filed:
Sep. 22, 2011
Sivaramakrishnan Narayanan, Sunnyvale, CA (US);
Florian Michael Waas, San Francisco, CA (US);
Sivaramakrishnan Narayanan, Sunnyvale, CA (US);
Florian Michael Waas, San Francisco, CA (US);
EMC Corporation, Hopkinton, MA (US);
Abstract
The invention enables a correlated or multi-row subquery (CSQ) to be performed on distributed MPP and shared-nothing databases by broadcasting intermediate results, prior to a correlation operation, from subquery execution on one segment to all other segments in the distributed database so that the respective CSQs of each segment will have access to the necessary results to permit correct execution of the CSQ. Additionally, the intermediate results are saved to disk to avoid the necessity of replicating the same intermediate results multiple times during execution of a subquery plan.